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基于nginx + lua实现的反向代理动态更新

2017-12-15 20:36 513 查看

大家都知道，nginx是当前应用非常广泛的web服务器，热度因为他的高并发高性能高可靠性，且轻量级！牛逼的不行，不多说这些。

今天要介绍的是，如何基于nginx和lua脚本，也就是在openresty的环境下，实现动态的反向代理逻辑，有一个开关控制。开关控制反向代理工作在nginx原生的upstream的模式，还是工作在lua控制的动态代理模式。动态代理的服务器，通过http请求实现灵活的操作，向lua_shared_dict定义的全局变量里面写入或者删除动态代理的服务器信息。

环境信息如下：

1 [root@bogon sbin]# ./nginx -V
2 nginx version: openresty/1.11.2.2
3 built by gcc 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC)
4 built with OpenSSL 1.0.1e-fips 11 Feb 2013
5 TLS SNI support enabled
6 configure arguments: --prefix=/usr/local/openresty/nginx --with-cc-opt=-O2 --add-module=../ngx_devel_kit-0.3.0 --add-module=../echo-nginx-module-0.60 --add-module=../xss-nginx-module-0.05 --add-module=../ngx_coolkit-0.2rc3 --add-module=../set-misc-nginx-module-0.31 --add-module=../form-input-nginx-module-0.12 --add-module=../encrypted-session-nginx-module-0.06 --add-module=../srcache-nginx-module-0.31 --add-module=../ngx_lua-0.10.7 --add-module=../ngx_lua_upstream-0.06 --add-module=../headers-more-nginx-module-0.32 --add-module=../array-var-nginx-module-0.05 --add-module=../memc-nginx-module-0.17 --add-module=../redis2-nginx-module-0.13 --add-module=../redis-nginx-module-0.3.7 --add-module=../rds-json-nginx-module-0.14 --add-module=../rds-csv-nginx-module-0.07 --with-ld-opt=-Wl,-rpath,/usr/local/openresty/luajit/lib --add-module=/opt/nginx-rtmp-module-master --with-http_ssl_module

先设计一下功能模块，在nginx.conf文件里面，有如下几个location：

location / {。。。}
业务逻辑的入口

location /config {。。。}
动态反向代理开关控制入口

location /add_ups {。。。}
添加反向代理的服务器信息进入lua_shared_dict定义的全局表单

location /stop_ups {。。。}
从lua_shared_dict定义的全局表单里面删除掉不再参与反向代理的服务器信息

location /check_ups {。。。}
查看当前lua_shared_dict定义的全局表单里面有那些服务器信息

为了验证这个设计，我在本地开发机器上，将同一个RDConsumer应用部署在3个不同的端口下，对应于nginx里面的upstream块：

upstream robot_ups {
server 10.90.9.20:8090;
server 10.90.9.20:8081;
server 10.90.9.20:9080;
}

在这里，强调一下，这里，我们验证的动态反向代理，是轮询的方式，当然，根据需要可以设计成符合各自业务的逻辑。

下面，对这个设计的全部过程进行详细介绍。若有需要，可以用起来或者转走，觉得好，还可以点个赞，或者加个关注！

1. nginx.conf的配置文件

#user  nobody;
worker_processes  4;

error_log  logs/error.log;
error_log  logs/error.log  notice;
error_log  logs/error.log  info;

#pid        logs/nginx.pid;

events {
worker_connections  1024;
use   epoll;
}

http {
lua_shared_dict dyn_ups_zone 10m;

include       mime.types;
default_type  application/octet-stream;

#log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
#                  '$status $body_bytes_sent "$http_referer" '
#                  '"$http_user_agent" "$http_x_forwarded_for"';

#access_log  logs/access.log  main;

sendfile        on;
#tcp_nopush     on;

#keepalive_timeout  0;
keepalive_timeout  65;

#gzip  on;

upstream robot_ups {
server 10.90.9.20:8090;
server 10.90.9.20:8081;
server 10.90.9.20:9080;
}

server {
listen       80;
server_name  localhost;

#charset koi8-r;

location / {
set_by_lua_file $cur_ups /opt/shihuc/luahome/ablb/bussups.lua
proxy_next_upstream off;
proxy_set_header Host $host:$server_port;
proxy_set_header Remote_Addr $remote_addr;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://$cur_ups; }

location /config {
default_type  text/plain;
content_by_lua_block {
local foo = ngx.req.get_uri_args()["foo"]
if foo == nil then
ngx.say("usage: /config?foo=off, or /config?foo=on")
return;
end
ngx.log(ngx.INFO, "config ab deploy feature: ", foo);
ngx.say("config ab deploy feature: ", foo);

ngx.shared.dyn_ups_zone:set("robotfoo", foo);
}
}

location /stop_ups {
default_type  text/plain;
content_by_lua_file /opt/shihuc/luahome/ablb/stopups.lua;
}

location /add_ups {
default_type  text/plain;
content_by_lua_block {
local add_s = ngx.req.get_uri_args()["ups"]
if add_s == nil then
ngx.say("usage: /add_ups?ups=x.x.x.x")
return "no add_s"
end
ngx.log(ngx.INFO, "add upstream server: ", add_s);
local dynupszone = ngx.shared.dyn_ups_zone;
local ups = dynupszone:get("robotups");
if ups == nil then
ngx.say("first init global dict dyn_ups_zone");
ups = add_s
else
local unders = "-";
ups = ups..unders
ups = ups..add_s
end
local succ, err, forcible = dynupszone:set("robotups", ups);
ngx.say("succ: ",succ, ", err: ", err, ", forcible: ", forcible);
ngx.say(dynupszone.get(dynupszone, "robotups"))
}
}

location /check_ups {
default_type  text/plain;
content_by_lua_block {
local dynupszone = ngx.shared.dyn_ups_zone;
local ups = dynupszone:get("robotups");
ngx.say(ups);
}
}

error_page   500 502 503 504  /50x.html;
location = /50x.html {
root   html;
}
}
}

View Code

2. 调用add_ups url向全局缓存lua_shared_dict dyn_ups_zone 10m填写数据。

对应的后台日志如下：

2017/12/14 18:46:47 [info] 4347#0: *1 [lua] content_by_lua(nginx.conf:133):7: add upstream server: 10.90.9.20:8081, client: 10.90.9.20, server: localhost, request: "GET /add_ups?ups=10.90.9.20:8081 HTTP/1.1", host: "10.90.7.10"
2017/12/14 18:48:35 [info] 4347#0: *3 [lua] content_by_lua(nginx.conf:133):7: add upstream server: 10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "GET /add_ups?ups=10.90.9.20:8090 HTTP/1.1", host: "10.90.7.10"
2017/12/14 18:49:05 [info] 4347#0: *3 [lua] content_by_lua(nginx.conf:133):7: add upstream server: 10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "GET /add_ups?ups=10.90.9.20:9080 HTTP/1.1", host: "10.90.7.10"

3. config配置灰度启用

日志请参考：

2017/12/14 18:58:05 [info] 4347#0: *7 [lua] content_by_lua(nginx.conf:103):7: config ab deploy feature: on, client: 10.90.9.20, server: localhost, request: "GET /config?foo=on HTTP/1.1", host: "10.90.7.10"

4. 在不做灰度停用机器的时候，看看请求如何调度。这里，我的测试应用在本地部署了3个，端口区分。在10.90.7.10这个nginx上做反向代理，轮询分发请求。我执行了4次请求，通过restlet client （chrome的一个http模拟插件），nginx的后台日志如下：

2017/12/14 19:01:18 [info] 4347#0: *9 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:8090-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:18 [info] 4347#0: *9 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:18 [info] 4347#0: *9 [lua] bussups.lua:29: cnt: nil, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:18 [info] 4347#0: *9 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:8090-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:18 [info] 4347#0: *9 [lua] bussups.lua:50: idx: 3, exc: 3 ,current ups: 10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:19 [info] 4347#0: *9 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:8090-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:19 [info] 4347#0: *9 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:19 [info] 4347#0: *9 [lua] bussups.lua:29: cnt: 1, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:19 [info] 4347#0: *9 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:8090-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:19 [info] 4347#0: *9 [lua] bussups.lua:50: idx: 1, exc: 3 ,current ups: 10.90.9.20:8081, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:21 [info] 4347#0: *9 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:8090-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:21 [info] 4347#0: *9 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:21 [info] 4347#0: *9 [lua] bussups.lua:29: cnt: 2, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:21 [info] 4347#0: *9 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:8090-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:21 [info] 4347#0: *9 [lua] bussups.lua:50: idx: 2, exc: 3 ,current ups: 10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:22 [info] 4347#0: *9 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:8090-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:22 [info] 4347#0: *9 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:22 [info] 4347#0: *9 [lua] bussups.lua:29: cnt: 3, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:22 [info] 4347#0: *9 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:8090-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:01:22 [info] 4347#0: *9 [lua] bussups.lua:50: idx: 3, exc: 3 ,current ups: 10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"

从日志看，轮询是没有问题的。轮询的依据，是在nginx的全局变量dyn_ups_zone里面定义了一个cnt的变量，记录请求次数。请求数与当前反向代理里面的机器数量求模。用余数作为lua列表的下标，求出服务器IP端口信息。作为反向代理的机器。
这里要注意的是：
a. lua数组或者列表下标不是从0开始，而是1.
b. lua数组的下标，可以是不同数据类型的值，不像java等高级语言，是数字下标。

5. 停用一台服务器，通过stop_ups调用。然后查看反向代理跳转是否生效。

发现stop操作，有点问题，请看下图，原来3个应用，停了中间一个，最后的ups列表中怎么只有一个应用服务器信息了？先看看stopups.lua的脚本吧：

#!/usr/bin/env lua

function split(s, delim)
if type(delim) ~= "string" or string.len(delim) <= 0 then
return
end

local start = 1
local t = {}
while true do
local pos = string.find (s, delim, start, true) -- plain find
if not pos then
break
end

table.insert (t, string.sub (s, start, pos - 1))
start = pos + string.len (delim)
end
table.insert (t, string.sub (s, start))

return t
end

local stop_s = ngx.req.get_uri_args()["ups"];
if stop_s == nil then
ngx.say("usage: /stop_ups?ups=x.x.x.x");
return "no stop_s"
end
ngx.say("stop upstream server: ", stop_s);
local dynupszone = ngx.shared.dyn_ups_zone;
local ups = dynupszone:get("robotups");
if ups == nil then
ngx.say("currently, there is no server ip to stop...");
return;
end
local table_ups = split(ups, "-");
ngx.say(table_ups);
local delid=0;
for k,v in ipairs(table_ups) do
ngx.say("key: ",k,", value: ", v);
if v == stop_s then
delid = k;
end
end
table_ups[delid] = nil;
ngx.say(table_ups);
local new_ups = table.concat(table_ups,"-");
ngx.say("new ups: ", new_ups);
dynupszone:set("robotups",new_ups);

分析一下，发现，table数据table_ups里面设置nil的值，其实也是可以的。但是，在做table.concat的时候，会将第一个nil作为数据拼接的结束标识了，于是nil后面的数据不被计入。调整一下统计余下应用服务器信息的算法。调整后如下（local table_ups = split(ups, "-");代码之前的不变）：

local table_ups = split(ups, "-");
ngx.say(table_ups);
local new_table_ups = {}
for k,v in ipairs(table_ups) do
ngx.say("key: ",k,", value: ", v);
if v ~= stop_s then
table.insert(new_table_ups, v);
end
end
ngx.say(new_table_ups);
local new_ups = table.concat(new_table_ups,"-");
ngx.say("new ups: ", new_ups);
dynupszone:set("robotups",new_ups);

重复前面的操作，再进行stop_ups，就得到合理的结果，如图:

在模拟发送请求4次，看看日志：

2017/12/14 19:18:38 [info] 4747#0: *6 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:38 [info] 4747#0: *6 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:38 [info] 4747#0: *6 [lua] bussups.lua:29: cnt: nil, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:38 [info] 4747#0: *6 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:38 [info] 4747#0: *6 [lua] bussups.lua:50: idx: 2, exc: 2 ,current ups: 10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:39 [info] 4747#0: *6 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:39 [info] 4747#0: *6 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:39 [info] 4747#0: *6 [lua] bussups.lua:29: cnt: 1, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:39 [info] 4747#0: *6 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:39 [info] 4747#0: *6 [lua] bussups.lua:50: idx: 1, exc: 2 ,current ups: 10.90.9.20:8081, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:29: cnt: 2, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:50: idx: 2, exc: 2 ,current ups: 10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:29: cnt: 3, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:18:40 [info] 4747#0: *6 [lua] bussups.lua:50: idx: 1, exc: 2 ,current ups: 10.90.9.20:8081, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"

从日志看，现在ups的服务器只有2个了，刚才stop掉的一个，不再了。执行4次请求，分别在余下的2个服务器之间轮询。合乎逻辑设计。

6. 关闭灰度发布的开发，执行config?foo=off。参考题config_off,nginx的后台日志如下：

2017/12/14 19:21:47 [info] 4747#0: *11 [lua] content_by_lua(nginx.conf:103):7: config ab deploy feature: off, client: 10.90.9.20, server: localhost, request: "GET /config?foo=off HTTP/1.1", host: "10.90.7.10"

7. 在关闭灰度开关的情况下，看看反向代理的逻辑。主要看看后台日志：

第1次请求：

2017/12/14 19:23:46 [info] 4747#0: *13 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:23:46 [info] 4747#0: *13 [lua] bussups.lua:28: foo: off, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:23:46 [info] 4747#0: *13 [lua] bussups.lua:29: cnt: 4, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:23:46 [info] 4747#0: *13 [lua] bussups.lua:56: use default upstream, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"

从部署的3台应用服务器上来看，这次调度到8089端口的应用了。

第2次请求：

2017/12/14 19:27:32 [info] 4747#0: *15 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:27:32 [info] 4747#0: *15 [lua] bussups.lua:28: foo: off, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:27:32 [info] 4747#0: *15 [lua] bussups.lua:29: cnt: 5, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:27:32 [info] 4747#0: *15 [lua] bussups.lua:56: use default upstream, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"

从部署的3台应用服务器上来看，这次调度到8081端口的应用了。

第3次请求：

2017/12/14 19:29:31 [info] 4747#0: *17 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:29:31 [info] 4747#0: *17 [lua] bussups.lua:28: foo: off, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:29:31 [info] 4747#0: *17 [lua] bussups.lua:29: cnt: 6, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:29:31 [info] 4747#0: *17 [lua] bussups.lua:56: use default upstream, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"

从部署的3台应用服务器上来看，这次调度到9080端口的应用了。

基于上面3次foo=off的模拟调用来看，程序运行于upstream模块的轮询模式。这个时候全局变量ups里面只有2个服务器应用。

8. 将刚才灰度停用的服务器8090加回来，再次启用foo=on，动态轮询验证。

2017/12/14 19:32:19 [info] 4747#0: *19 [lua] content_by_lua(nginx.conf:133):7: add upstream server: 10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "GET /add_ups?ups=10.90.9.20:8090 HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:01 [info] 4747#0: *23 [lua] content_by_lua(nginx.conf:103):7: config ab deploy feature: on, client: 10.90.9.20, server: localhost, request: "GET /config?foo=on HTTP/1.1", host: "10.90.7.10"

2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080-10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:29: cnt: 7, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:9080-10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:50: idx: 1, exc: 3 ,current ups: 10.90.9.20:8081, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080-10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:29: cnt: 8, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:9080-10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:20 [info] 4747#0: *23 [lua] bussups.lua:50: idx: 2, exc: 3 ,current ups: 10.90.9.20:9080, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:21 [info] 4747#0: *23 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080-10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:21 [info] 4747#0: *23 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:21 [info] 4747#0: *23 [lua] bussups.lua:29: cnt: 9, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:21 [info] 4747#0: *23 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:9080-10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:21 [info] 4747#0: *23 [lua] bussups.lua:50: idx: 3, exc: 3 ,current ups: 10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:22 [info] 4747#0: *23 [lua] bussups.lua:27: ups: 10.90.9.20:8081-10.90.9.20:9080-10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:22 [info] 4747#0: *23 [lua] bussups.lua:28: foo: on, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:22 [info] 4747#0: *23 [lua] bussups.lua:29: cnt: 10, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:22 [info] 4747#0: *23 [lua] bussups.lua:39: ups list: 10.90.9.20:8081-10.90.9.20:9080-10.90.9.20:8090, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"
2017/12/14 19:34:22 [info] 4747#0: *23 [lua] bussups.lua:50: idx: 1, exc: 3 ,current ups: 10.90.9.20:8081, client: 10.90.9.20, server: localhost, request: "POST /RDConsumer/httpclient/conrst HTTP/1.1", host: "10.90.7.10"

从nginx日志以及应用程序的后台日志看，灰度的负载均衡方向代理逻辑，依然正常。

到此，整个验证完美收官！下面，附上，nginx.conf配置中涉及到的几个lua的脚本文件：

bussups.lua:

#!/usr/bin/env lua

function split(s, delim)
if type(delim) ~= "string" or string.len(delim) <= 0 then
return
end

local start = 1
local t = {}
while true do
local pos = string.find (s, delim, start, true) -- plain find
if not pos then
break
end

table.insert (t, string.sub (s, start, pos - 1))
start = pos + string.len (delim)
end
table.insert (t, string.sub (s, start))

return t
end

local ups = ngx.shared.dyn_ups_zone:get("robotups");
local foo = ngx.shared.dyn_ups_zone:get("robotfoo");
local cnt = ngx.shared.dyn_ups_zone:get("robotcnt");
ngx.log(ngx.INFO, "ups: ", ups);
ngx.log(ngx.INFO, "foo: ", foo);
ngx.log(ngx.INFO, "cnt: ", cnt);

if cnt == nil then
cnt = 0;
end
ngx.shared.dyn_ups_zone:set("robotcnt", cnt+1);

if foo == "on" then
if ups ~= nil then
--ngx.log(ngx.info, "get robotups server list: ", ups)
ngx.log(ngx.INFO, "ups list: ", ups);
local table_ups = split(ups, "-");
local exc = 0;
for k,v in ipairs(table_ups) do
exc = exc + 1;
end
local idx = cnt % exc;
if idx == 0 then  --lua array index from 1, not from 0
idx = exc;
end
local cur_ups = table_ups[idx];
ngx.log(ngx.INFO, "idx: ", idx, ", exc: ", exc,  " ,current ups: ", cur_ups);
return cur_ups
end
ngx.log(ngx.INFO, "ab lb configuration error, use default upstream");
return "robot_ups";
else
ngx.log(ngx.INFO, "use default upstream");
return "robot_ups";
end

stopups.lua:

#!/usr/bin/env lua

function split(s, delim)
if type(delim) ~= "string" or string.len(delim) <= 0 then
return
end

local start = 1
local t = {}
while true do
local pos = string.find (s, delim, start, true) -- plain find
if not pos then
break
end

table.insert (t, string.sub (s, start, pos - 1))
start = pos + string.len (delim)
end
table.insert (t, string.sub (s, start))

return t
end

local stop_s = ngx.req.get_uri_args()["ups"];
if stop_s == nil then
ngx.say("usage: /stop_ups?ups=x.x.x.x");
return "no stop_s"
end
ngx.say("stop upstream server: ", stop_s);
local dynupszone = ngx.shared.dyn_ups_zone;
local ups = dynupszone:get("robotups");
if ups == nil then
ngx.say("currently, there is no server ip to stop...");
return;
end
local table_ups = split(ups, "-");
ngx.say(table_ups);
local new_table_ups = {}
for k,v in ipairs(table_ups) do
ngx.say("key: ",k,", value: ", v);
if v ~= stop_s then
table.insert(new_table_ups, v);
end
end
ngx.say(new_table_ups);
local new_ups = table.concat(new_table_ups,"-");
ngx.say("new ups: ", new_ups);
dynupszone:set("robotups",new_ups);

nginx功能强大，配合上lua脚本，在ngx_lua模块的存在下，功能就更加强大。感兴趣的话，可以加我关注哟，我们一起探讨！

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